[Hammarlund] HQ-129X 6SG7 RF

[joel hallas]

Gents,

The unique feature of the 6SS7 is that its filament current is 0.15 A 
rather than 0.3 A for most other tubes of the series. While others will 
work, and perhaps one won't hurt much, if they were all changed it would 
result in a significant increase in load on the filament winding. A 6SS7 
is a lot cheaper and easier to find than a power transformer, IMHO. I 
wouldn't chance it.

Regards & GL, Joel, W1ZR

Todd, KA1KAQ wrote:

>On Thu, 27 Jan 2005 22:01:17 -0500, RJ Mattson <rjmattson at hvi.net> wrote:
>  
>
>>I am restoring my HQ-129X and notice the RF amp is a 6SG7 instead of the normal 6SS7.
>>Looks like the socket has been rewired because of the shiny solder and slightly burnt insulation on some terminals.
>>Is this a worthy upgrade or should I restore to the 6SS7?
>>I'm leaning to return the 6SS7 for purity.
>>Help
>>    
>>
>
>Bob - 
>
>Not sure if it's an upgrade or more of a substitute since the 6SS7 is
>not as plentiful. I should look inside mine to see if it's been
>changed. 6SS7s probably don't qualify as a rare tube, just not used in
>the numbers that many others were. Personally, I don't care to change
>or try to somehow 'improve' on an old classic like the '129 or any
>other. It was designed to do a job and apparently did it well,
>considering the reputation is has. If I want a radio that somehow
>works 'better' or differently, I'd rather use something else than hack
>up a perfectly good radio in some attempt to make it 'better'. Makes
>me think of someone trying to turn a Mustang into a Ferrari.
>
>Of course, the original owner may have had only that receiver and no
>access (or finances available) to use something else. Back then, you
>made the best of whatever you had, and the HQ-129X was probably the
>equivalent of a typical Yaecomwood radio to today's ham - not all that
>rare or particularly special. I suspect most people use these old rigs
>now because they want to and enjoy them, not because they have no
>other choice.
>
>I'd be interested in hearing what you find out about the mod, why it
>might have been done and whether it was really an upgrade, or just a
>substitute to get the rig back on the air.
>
>73, Todd/'Boomer'  KA1KAQ
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